Custom made menu hotkey problem, blender doesn't find it unless I run it form the text editor
for anyone facing the same problem in the future here is the solution, thanx again to  batFINGER for helping me find it. 
you need to make sure that you put your blender version in the script's dictionary, in my example:

bl_info = {
&nbsp;&nbsp;&nbsp;&nbsp;"name" : "customMenu", 
&nbsp;&nbsp;&nbsp;&nbsp;"category" : "3D View", 
&nbsp;&nbsp;&nbsp;&nbsp;"author" : "Edo", 
&nbsp;&nbsp;&nbsp;&nbsp;"blender" : (2,80,0) 
}